<template>
    <el-container class="home-container">
      <!-- 头部区域 -->
      <el-header>
        <div>
          <img src="../assets/heima.png" alt="">
          <span>电商后台管理系统</span>
        </div>
        <el-button type="info" @click="logout">退出</el-button> 
      </el-header>
      <!-- 页面主题区 -->
      <el-container>
        <!-- 侧边栏 -->
        <el-aside :width="isCollapse ? '64px' : '200px'">
          <div class="toggle-button" @click="toggleCollapse">|||</div>
          <!-- 侧边栏菜单区 -->    
            <el-menu
        background-color="#333747"
        text-color="#fff"
        active-text-color="#409EFF"
        unique-opened
        :collapse="isCollapse"
        :collapse-transition="false"
        router
        :default-active="activePath">
        <!-- 一级菜单 -->
        <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id">
          <!-- 一级菜单的模板区 -->
          <template slot="title">
            <!-- 图标 -->
            <i :class="iconsObj[item.id]"></i>
            <!-- 文本 -->
            <span>{{item.authName}}</span>
          </template>
          <!-- 二级菜单 -->
          <el-menu-item :index=" '/' + subItem.path" v-for="subItem in item.children" 
          :key="subItem.id" @click="saveNavState('/' + subItem.path)">
            <template slot="title">
            <!-- 图标 -->
            <i class="el-icon-menu"></i>
            <!-- 文本 -->
            <span>{{subItem.authName}}</span>
          </template>
          </el-menu-item>
        </el-submenu>
      </el-menu>
        </el-aside>
        <!-- 右侧内容主题 -->
        <el-main>
          <!-- 路由占位符 -->
          <router-view></router-view>
        </el-main>
      </el-container>
    </el-container>
</template>

<script>
export default {
  data() {
    return {
      // 左侧菜单 
      menulist: [],
      // 菜单对应的图标
      iconsObj: {
        '125':'el-icon-s-custom',
        '103':'el-icon-s-claim',
        '101':'el-icon-s-goods',
        '102':'el-icon-s-order',
        '145':'el-icon-s-marketing'
      },
      // 是否折叠（默认不折叠）
      isCollapse:false,
      // 被激活的链接地址
      activePath:''
    }
  },
    created(){
      this.getMenuList()
      this.activePath = window.sessionStorage.getItem('activePath')
    },
    methods: {
        logout() {
            window.sessionStorage.clear()
            this.$router.push('/login')
        },
        // 获取所有的菜单
        async getMenuList() {
        const {data : res} = await this.$http.get('menus')
        if(res.meta.status !== 200) return this.$message.error(res.meta.msg)
        this.menulist = res.data
        // console.log(res);
        },
        // 点击按钮实现菜单的折叠与展开
        toggleCollapse(){
          this.isCollapse = !this.isCollapse
        },
        // 保存链接的激活状态
        saveNavState(activePath){
          window.sessionStorage.setItem('activePath',activePath)
          this.activePath = activePath
        }
    }
}
</script>

<style lang="less" scoped>
.el-header{
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 0px;
  align-items: center;
  color: #fff;
  font-size: 20px;
  div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}
.el-aside{
  background-color: #333744;
  .el-menu{
    border-right: 0px;
  }
}
.el-main{
  background-color: #EAEDF1;
}
.home-container{
  height: 100%;
}
.toggle-button{
  background-color: #4A5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>